i am learning about capital letters in English and i need to write a sentence about Earth. i was just wondering if planet has to have a capital letter.

Planet Earth or planet Earth which is right?
thanks!

thanks for that link. i thought i would show you what my homework is and ask you if possible to check that its right.

My homework is to put capital letters in the right places. this is how ive done it.
Lara Smith is a General in the Galactic Police.She fights against the evil Doctor Dark from Planet Dundar.On Tuesday 4th June 2033 Lara travelled from Earth on the space craft Zodiac to capture Doctor Dark and the Dunderans.

i`d be very grateful if you could check it for me and tell me if anything is wrong. thanks so much.

Lara Smith is a General in the Galactic Police.She fights against the evil Doctor Dark from Planet Dundar.On Tuesday 4th June 2033 Lara travelled from Earth on the space craft Zodiac to capture Doctor Dark and the Dunderans.

General is not capitalized unless it accompanies a name... General Robert E. Lee.

It should be On Tuesday, June 4, 2033,

thanks so much for helping me with my english i appreciate it . :)

When it comes to capitalization, it is important to remember that common nouns, such as "planet," generally do not need to be capitalized. However, when "planet" is used as part of a specific proper noun, like "Planet Earth," it does require a capital letter.

In your case, when referring to our specific planet, you should write "Planet Earth" with both words capitalized. This is because "Planet Earth" is a distinctive name referring to the third planet in our solar system.

To understand the capitalization rule, it can be helpful to remember that proper nouns, which are specific names for people, places, things, or ideas, require capitalization. Common nouns, on the other hand, are general names for these same categories and typically do not require capitalization.

So, to summarize, in the sentence about Earth, you should write: "I love exploring Planet Earth."